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Infrared OH — Absorption Bands in Potassium Lithium Niobate Single Crystals
Author(s) -
Hoon Kim Tae,
Moon Yu Young,
Lee Kwanghee,
Hyun Ro Ji
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200110)227:2<485::aid-pssb485>3.0.co;2-4
Subject(s) - lithium niobate , potassium niobate , infrared spectroscopy , potassium , single crystal , absorption (acoustics) , infrared , ion , octahedron , lithium (medication) , crystal (programming language) , analytical chemistry (journal) , polarization (electrochemistry) , absorption spectroscopy , materials science , oxygen , chemistry , crystallography , crystal structure , ferroelectricity , optics , medicine , programming language , physics , optoelectronics , organic chemistry , chromatography , computer science , dielectric , metallurgy , composite material , endocrinology
The existence of protons (H + ) was characterized by infrared absorption spectroscopy in potassium lithium niobate single crystals with a lower than 1.5 Li content. The as‐grown crystals showed a broad OH — stretching vibration near 3500 cm —1 and contained about 5.5 × 10 18 cm —3 protons. Especially, the concentration of the protons increased about one order of the magnitude after heat treatment in a humid atmosphere. From the measurements of the polarization dependence of the OH — absorption bands in this crystal, we can expect that the OH — ions vibrate along the c ‐axis and O–O edges of an oxygen octahedron. It shows a different aspect in comparison with LiNbO 3 single crystals due to the different structure and the cation environment.